check your wiring for your lights under the dash or a bad ground
CHECK THE FUSE PANEL DASH & TAIL LIGHTS WORK FROM SAME FUSE
Check the fuses.
Check your fuse. Usually the manufacturer has the dash lights and the tail lights on the same circuit.
If you dash lights are not working check that your parking/brake lights are working also check fuses for cig lighter and interior lights that may help get the dash light working again.
The first check would be the fuse for the dash lights. If the dash lights are out too then it is likely to be the fuse.
Check the fuses.
Check fuse for parking/tail dash lights Could be an open in dimmer rheostat
check your fuses?
Check for a blown fuse
What year is the vehicle? Did you check the fuse?
check the Bulbs